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Porous Media Zone Thickness

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Old   October 5, 2020, 00:42
Default Porous Media Zone Thickness
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Emily Blanch
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Hello, I am looking to model a region of my model with a porous media. The region consists of a tube that contracts into another tube, of smaller diameter. The tube with smaller diameter contains trip strips, and ultimately dumps to a series of small holes. I have dp vs velocity information for the combined effect of the contraction into the smaller cylinder, the trip strips, and the small holes. I am looking to replace the smaller tube with a porous media.

I only really care about capturing the pressure drop due to the porous media in my model, which lead me to think I could use a porous jump boundary. However, from what I understand, a porous jump boundary can only be used on an internal boundary interface. This would not work for my case, as I am looking to define the porous media downstream static pressure as a boundary condition. Since I must use a porous media zone (instead of a porous jump), I am looking to define the porous zone as small as possible to save on cell count.

My question is, when calculating the porous media zone coefficients (viscous & inertial resistances), I must divide by the porous media thickness. Is the porous media thickness the actual physical length of the porous media, or is it the non-physical length of the porous media I created in my model?
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